Please Call for Pricing and Availability. This portable monitor unit easily plugs into any high or low pressure compressed breathing air source and monitors the air for CO content. The audible alarm (90dbA) will activate when the CO level exceeds 10ppm (5ppm International). External alarm and lights allow for the unit to be used in the closed position. CO91-14LAC Portable CO monitor, 9 VDC and/or 115 VAC, 5ft. hose, 150psi maximum inlet pressureCO91-14HAC Portable CO monitor, 9 VDC and/or 115 VAC, 5ft. hose, rated for 5000psi maximum pressure, includes 6000psi regulator and 5ft. hose CO-91LACG Portable CO monitor with built-in calibration gas cylinders, 150psi maximum, includes calibration gas and regulator CO-91HACG Portable CO monitor with built-in calibration gas cylinders, rated for 6000psi maximum pressure, includes calibration gas and regulator CO2-91LAC Portable CO/O2 monitor, 9 VDC and/or 115 VAC, 5ft. hose, 150psi maximum inlet pressureCO91-14IS Portable Intrinsically Safe CO monitor, 9 VDC only, approved for Class I, Division 1, Groups C and D environments, audible alarm, visual lights, flowmeter, quick connect calibration fitting, LCD display